In Firefox, I see a lock only if the layer is locked. Any unlocked layer shows no lock at all. Thus, if I didn't already know where the empty spot is, I wouldn't be able to lock a layer.

Opinion: The lock should be larger and more sharply defined. Also, gray symbolizes something that can't be clicked, and blue is symbolic of an active hotlink. I understand the reticence to use red and green, which hits those with the most common type of colorblindness, so maybe using the picture of a lock isn't the best choice, not in such a minuscule size, but I can't immediately think of something better.

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